Abstract
We determined electronic relaxation times via pump-probe optical spectroscopy using sub-15 fs pulses for the normal state of two different cuprate superconductors. We show that the primary relaxation process is the electron-phonon interaction and extract a measure of its strength, the second moment of the Eliashberg function for and for . These values suggest a possible fundamental role of the electron-phonon interaction in the superconducting pairing mechanism.
- Received 6 March 2009
DOI:https://doi.org/10.1103/PhysRevLett.105.257001
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